First image is an example on how to do this exercise.  Table one is a reference I need help to find the target inventory, T   Sam's Cat Hotel operates 52 weeks per​ year, 6 days per week. It purchases kitty litter for $8.00 per bag. The following information is available about these​ bags:   ≻Demand ​= 55 bags/week ≻Order cost​ = $70​/order ≻Annual holding cost​ = 22 percent of cost ≻Desired cycle-service level= 99 percent ≻Lead time​ = 4 week(s) (24 working​ days) ≻Standard deviation of weekly demand​ = 4 bags ≻Current on-hand inventory is 250 bags, with no open orders or backorders.   Suppose that​ Sam's Cat Hotel uses a P system. The average daily​ demand, d​, is 9 bags (55​/6​), and the standard deviation of daily demand, Standard Deviation of Weekly DemandDays per Week​/square root of Days per Week, is 1.633 bags. Refer to the standard normal table for​ z-values. a. What P​ (in working​ days) and T should be used to approximate the cost​ trade-offs of the​ EOQ? The time between​ orders, P, should be 5252 days. ​(Enter your response rounded to the nearest whole​ number.)   The target​ inventory, T, should be enter your response here bags. ​(Enter your response rounded to the nearest whole​ number.)

Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
Section: Chapter Questions
Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...
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First image is an example on how to do this exercise. 
Table one is a reference
I need help to find the target inventory, T
 
Sam's Cat Hotel operates 52 weeks per​ year, 6 days per week. It purchases kitty litter for $8.00 per bag. The following information is available about these​ bags:
 
≻Demand ​= 55 bags/week
≻Order cost​ = $70​/order
≻Annual holding cost​ = 22 percent of cost
≻Desired cycle-service level= 99 percent
≻Lead time​ = 4 week(s) (24 working​ days)
≻Standard deviation of weekly demand​ = 4 bags
≻Current on-hand inventory is 250 bags, with no open orders or backorders.
 
Suppose that​ Sam's Cat Hotel uses a P system. The average daily​ demand, d​, is 9 bags (55​/6​), and the standard deviation of daily demand,
Standard Deviation of Weekly DemandDays per Week​/square root of Days per Week, is 1.633 bags. Refer to the standard normal table
for​ z-values.
a. What P​ (in working​ days) and T should be used to approximate the cost​ trade-offs of the​ EOQ?
The time between​ orders, P, should be 5252 days. ​(Enter your response rounded to the nearest whole​ number.)
 
The target​ inventory, T, should be enter your response here
bags. ​(Enter your response rounded to the nearest whole​ number.)
The table displayed on this page represents the total area under the normal curve for a point that is a certain number of Z standard deviations to the right of the mean. This is often referred to as a Z-table.

### Explanation of the Table:

- **Row Labels (Z):** The row headers indicate the Z-value up to one decimal place. These are whole numbers and one decimal (e.g., 0.0, 0.1, 0.2, etc.).
  
- **Column Labels:** Denote the second decimal place of the Z-value, ranging from 0.00 to 0.09.

- **Table Data:** Each cell within the table represents the cumulative probability (area under the curve) for the corresponding Z-value. This means the proportion of data within a standard normal distribution that is below this Z-score.

### How to Use the Z-table:

1. **Determine the Z-score** for which you want to find the cumulative probability.

2. **Locate the Z-value**:
   - Find the whole number and the first decimal in the far-left column (e.g., 1.3).
   - Find the second decimal in the top row (e.g., 0.04).

3. **Find the Intersection**: 
   - Move across the row of your Z-value and down the column of your second decimal to find the value at the intersection.
   - This value is the cumulative probability.

### Example:

For a Z-value of 1.36:
- Find 1.3 in the Z column.
- Move across to the 0.06 column.
- The intersecting value is 0.9131, indicating that approximately 91.31% of the data falls below a Z-score of 1.36 in a standard normal distribution.

This table helps in statistical analysis to determine probabilities and is widely used in fields such as psychology, finance, and other sciences.
Transcribed Image Text:The table displayed on this page represents the total area under the normal curve for a point that is a certain number of Z standard deviations to the right of the mean. This is often referred to as a Z-table. ### Explanation of the Table: - **Row Labels (Z):** The row headers indicate the Z-value up to one decimal place. These are whole numbers and one decimal (e.g., 0.0, 0.1, 0.2, etc.). - **Column Labels:** Denote the second decimal place of the Z-value, ranging from 0.00 to 0.09. - **Table Data:** Each cell within the table represents the cumulative probability (area under the curve) for the corresponding Z-value. This means the proportion of data within a standard normal distribution that is below this Z-score. ### How to Use the Z-table: 1. **Determine the Z-score** for which you want to find the cumulative probability. 2. **Locate the Z-value**: - Find the whole number and the first decimal in the far-left column (e.g., 1.3). - Find the second decimal in the top row (e.g., 0.04). 3. **Find the Intersection**: - Move across the row of your Z-value and down the column of your second decimal to find the value at the intersection. - This value is the cumulative probability. ### Example: For a Z-value of 1.36: - Find 1.3 in the Z column. - Move across to the 0.06 column. - The intersecting value is 0.9131, indicating that approximately 91.31% of the data falls below a Z-score of 1.36 in a standard normal distribution. This table helps in statistical analysis to determine probabilities and is widely used in fields such as psychology, finance, and other sciences.
**Petromax Enterprises Inventory Control System**

Petromax Enterprises uses a continuous review inventory control system for one of its SKUs. Below is the relevant information for this item. The firm operates 52 weeks in a year. A standard normal table is used for z-values.

- **Demand** = 91,000 units/year
- **Ordering cost** = $30.00/order
- **Holding cost** = $3.00/unit/year
- **Average lead time** = 9 weeks
- **Standard deviation of weekly demand** = 120 units

### a. What is the economic order quantity?

The **Economic Order Quantity (EOQ)** is calculated as:

\[
EOQ = \sqrt{\frac{2DS}{H}}
\]

where:
- \( D \) is the demand in units per year,
- \( S \) is the ordering cost,
- \( H \) is the inventory holding cost.

For this item, the EOQ calculation is:

\[
EOQ = \sqrt{\frac{2 \times 91,000 \times 30.00}{3.00}} = 1,349 \text{ units}
\]

### b. What should be the safety stock and reorder point for a 98% service level?

To provide this service level, the safety stock is calculated using:

\[
z\sigma_{dLT}, \text{ where } \sigma_{dLT} = \sigma_d\sqrt{L}
\]

Given:
- The standard deviation of weekly demand, \( \sigma_d \) = 120 units.
- Lead time, \( L \) = 9 weeks.
- From the standard normal table, the z value for a 98% service level is 2.06.

The safety stock calculation:

\[
2.06 \times 120 \times \sqrt{9} = 742 \text{ units}
\]

Weekly demand, \( \bar{d} \), is calculated as:

\[
\bar{d} = \frac{91,000}{52} = 1,750 \text{ units}
\]

The demand during lead time, \( d_L \), is:

\[
d_L = 1,750 \times 9 = 15,750 \text{ units}
\]

Finally, the reorder point is:

\[
15,750 + 742 = 16,492 \text{ units}
Transcribed Image Text:**Petromax Enterprises Inventory Control System** Petromax Enterprises uses a continuous review inventory control system for one of its SKUs. Below is the relevant information for this item. The firm operates 52 weeks in a year. A standard normal table is used for z-values. - **Demand** = 91,000 units/year - **Ordering cost** = $30.00/order - **Holding cost** = $3.00/unit/year - **Average lead time** = 9 weeks - **Standard deviation of weekly demand** = 120 units ### a. What is the economic order quantity? The **Economic Order Quantity (EOQ)** is calculated as: \[ EOQ = \sqrt{\frac{2DS}{H}} \] where: - \( D \) is the demand in units per year, - \( S \) is the ordering cost, - \( H \) is the inventory holding cost. For this item, the EOQ calculation is: \[ EOQ = \sqrt{\frac{2 \times 91,000 \times 30.00}{3.00}} = 1,349 \text{ units} \] ### b. What should be the safety stock and reorder point for a 98% service level? To provide this service level, the safety stock is calculated using: \[ z\sigma_{dLT}, \text{ where } \sigma_{dLT} = \sigma_d\sqrt{L} \] Given: - The standard deviation of weekly demand, \( \sigma_d \) = 120 units. - Lead time, \( L \) = 9 weeks. - From the standard normal table, the z value for a 98% service level is 2.06. The safety stock calculation: \[ 2.06 \times 120 \times \sqrt{9} = 742 \text{ units} \] Weekly demand, \( \bar{d} \), is calculated as: \[ \bar{d} = \frac{91,000}{52} = 1,750 \text{ units} \] The demand during lead time, \( d_L \), is: \[ d_L = 1,750 \times 9 = 15,750 \text{ units} \] Finally, the reorder point is: \[ 15,750 + 742 = 16,492 \text{ units}
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